Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9d5e720b4416859…

MALICIOUS

PDF

43.5 KB Created: 2020-08-06 15:32:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dcec42b857b919fc947d83dc1dc57269 SHA-1: 33fa4eddc1efd943f0f286ab0c960308b6274637 SHA-256: d9d5e720b4416859491526c29cc8dd8a7111055a4edbc77a2223dd76e9e35e0f
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link to a known malicious redirector, ttraff.ru, which is likely used to obscure the final destination of the malicious payload. The document body, though heavily obfuscated, contains the same URL and a title suggesting a lure. The presence of numerous links to Shopify-hosted PDFs indicates a link farm strategy, likely for SEO poisoning to increase the chances of users encountering the malicious document. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/wb?keyword=les%20inconvenients%20du%20telephone%20portable%20a%20l
    • http://files.thehnossaproject.com/uploads/1/3/1/3/131383892/1f0952e.pdf
    • http://files.uniqueherbalcreations.com/uploads/1/3/0/8/130813400/ba0bdf8c.pdf
    • http://files.seejaysrepairs.com/uploads/1/3/1/3/131384401/sejetururef_zuxod.pdf
    • https://cdn.shopify.com/s/files/1/0429/8499/7025/files/56729149892.pdf
    • https://cdn.shopify.com/s/files/1/0436/0280/4898/files/kewomuk.pdf
    • https://cdn.shopify.com/s/files/1/0430/5358/0441/files/47921237267.pdf
    • https://cdn.shopify.com/s/files/1/0433/5340/7646/files/99663564814.pdf
    • https://cdn.shopify.com/s/files/1/0436/1961/4882/files/gizelewo.pdf
    • https://cdn.shopify.com/s/files/1/0432/5857/7046/files/laxifajumoxeveso.pdf
    • https://cdn.shopify.com/s/files/1/0438/4302/7104/files/tetekaditik.pdf
    • https://cdn.shopify.com/s/files/1/0430/6999/7207/files/33736147193.pdf
    • https://cdn.shopify.com/s/files/1/0432/6057/5894/files/23590961905.pdf
    • https://cdn.shopify.com/s/files/1/0431/2737/3986/files/22495088306.pdf
    • https://cdn.shopify.com/s/files/1/0434/0147/8307/files/amino_acid_analyzer.pdf
    • https://cdn.shopify.com/s/files/1/0430/8385/8073/files/36758022659.pdf
    • https://cdn.shopify.com/s/files/1/0435/2252/3288/files/7694416392.pdf
    • https://cdn.shopify.com/s/files/1/0435/8009/6667/files/wijeko.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000065ef.bin
e075c7f5a53157ece8fec00b0280d3d0d76cdb14f75b50937108aa40fe8b6c67
pdf-font-stream PDF embedded font (sfnt) at offset 0x65EF 5420 bytes
font_01_sfnt_off00007862.bin
2ea004adc162696a9157101d4140b76043bb27c44257850359ec4e46e3da51da
pdf-font-stream PDF embedded font (sfnt) at offset 0x7862 12496 bytes